Effect of Suspension Winding Pole Pair and Permanent Magnet Thickness on Magnetic Levitation Force in Bearingless PMSM.

One maintenance task that still exist with conventional motors, are bearing lubrication and renewal. Bearingless motors are replaced with conventional motor that uses a magnetic levitation force to suspend a rotor without any mechanical contact. In bearingless motors, additional windings are wound together with motor windings in stator slots. In this paper, a bearingless permanent magnet-type synchronous motor (BPMSM) Has been studied. First, the generation of radial levitation forces is discussed and then the optimum permanent magnet thickness is determined to produce maximum levitation force. After that the effect of additional winding pole-pair in the amount of levitation force is investigated. The simulation is done in Maxwell software.